Improvement in metal-rolling apparatus



linied mes "tutti Lette/rs Patent No. 96,600, dated4 llrmfember 9, 1869.

IMPROVEMENI IN METAL-ROLLING- APPARATUS.

The Schedule referred to in vthese Letters Patent and making Pm f the am To all whom it may concern r Be it known that I, JOHN Lrrrmcorr, of the city of Pittsburg, in the county of Allegheny, and State of Pennsylvania, have invented a new and useful Improvement in Rolls for Rolling Metals; and I do hereby declare the following to be a full, clear, and exact description thereof.

It is a well-established fact that cylindrical rolls, such as are employed for rolling sheets or slabs of iron and steel, expand when heated by the hot sheets or slabs passing between them; and, notwithstanding that the rolls are turned slightly concave, to compensate for the expansion, i'the rolling is continued beyond a certain point, the expansion progresses to such a degree as to compel a cessation .of the work, until the rolls become somewhat cooled.

It isy also customarytO-ruu water ou to the rolls, during the process of rolling, in order to keep down their temperature, but this is also objectionable, since the constant expansion and contraction of the metal tend to weaken it, and the rolls frequently break. In rolling hot sheets or slabs, the rolls generally heat and expand most in the middle, where they are most used, with a consequent tendency' to convexity, so that, being higher in the middle than at either end, the greatest strain is there, and the sheets or slabs are pulled or warped in consequence, and are not rolled evenly.

These difficulties I avoid, and entirely overcome excessive expansion and contraction in the rolls, and pre,- vent the heat accumulating beyond apoint, at which vno injury can result, either by expansion in the rolls or injurious eects to the sheets or slabs passing between them.

I also enable the operator to-run his rolls continuously, without loss of time in waiting for the rolls to cool. l

The nature of my invention consists in passingr a stream or current oi' water or a bla-st of air through a hollow cavity or chamber, which extends lengthwise through each roll, for the.I purpose of preventing the undue heating of such roll, and in the construction of devices for supplying hollow rolls with wat-er for such purposes.

To enable others'skilled in the art to make and use my invention, I will describe its construction and manner oi' use, referring, forl that' purpose, to the accompanying drawing, making a part of this specification,

Each of the rolls a a',I cast in a mould, and around a core of any usual or known" construction, whereby a. cavity or chamber, e, will be secured, extending lengthwise of the roll from end to end. This cavity-'e may be of any desirable shape, o r of any size, invcross-section, provided sufficient thicknessof roll be left to insure the required strength. the usual way. If deemed desirable, the rolls maybe chilled on their inner surface, and cooled from the centre. In this way they may be made of great vdensity and strength.

In order to overcome the expansion and contraction, which in rolls for rollingvirou and steel is so ob jectionable, and,.keep the rolls, while in use, at a temperature as nearly uniform as possible, I pass a flow of-colr1 Water vtzliirough them,along .the cylindrical cavity c, which cames oi the heat as fast as it is absorbed by the roll.

This result I accomplish by connecting with the necks of the rolls, the hose-pipe (I, in any convenient way, whereby water will be freely supplied as the rolls revolve.

One form of coupling is shown in tig. I, in which c is a tube, set into the neck of the roll.

c' is a sleeve, which couples the rolls a a and nozzles i together, and which slides, soas to permit the roll to revolve, while the pipe d remains stationary.

The water may be turned on and ofi by cocks of the usual construction. Similar attachments may he made to carry the water oli at the opposite ends o the rolls c a. A,

By the use of the devices described, the, temperature of the rolls can -be regulated at pleasure. 'Ihe water may ow, or be forced through more or less rapidly, or turned on and oi, at intervals, as the operator may desire or nd most expedient.

A blast ot' cold air or other Huid may take the place of the water, both inthe casting and in the rolling, orl in either separately, and such blast be forced. through by a fan, or other equivalent device, with useful result.

` I am aware that hollow rolls have been used in mangles, for purposes of drying, the rolls being rst heated to a moderate temperature, by the introduction of red-hot iron, heated gravel stones, boiling water, alcohol, or other like meals; but in rolling iron, the intense heat of the metal, which passed through, speedily raises theY temperature of the rolls to such a degree, as' greatly to injure the rolls, and hence the necessityof 'so constructing them as to pass through them continuouslya cooling iiuid, to keep their temperature down, and at a uniform degree, as near as may be.

,-lhe casting is done in The usesnre entirely dierent, and the ends to stantly kept flowing through them, substantially as be attained are so essentially diverse, that oneV described, for the purpose set forth. device would not be suggestive of the other; hence, In testimony whereof, I, the said JOHN LIPPIN- What I claim as my invention, and desire to se- GOTT, have-hereunto set my hand.

cure by Letters Patent, is JOHN LIPPINCOTT.

Constructing rolls, for metal-rolling mills, hollow, Witnesses: and adapt-ing, to said hollow rolls, tubes or other ap- A. S. NICHOLSON,

plizmces, by which a stream of waiter may be con- G. H. CHRISTY, 

